labsguru

int buzzer = 8; // set the buzzer control digital IO pin 
void setup() { 
pinMode(buzzer, OUTPUT); // set pin 8 as output
 }
void loop() { 
for (int i = 0; i < 80; i++) { 
     digitalWrite(buzzer, HIGH); // make a sound
     delay(1); // send high signal to buzzer
     digitalWrite(buzzer, LOW); // delay 1ms
     delay(1); // send low signal to buzzer 

labsguru

#include "HX710B.h"
const int DOUT = 2;   //sensor data pin
const int SCLK  = 3;   //sensor clock pin
HX710B pressure_sensor; 
 
void setup() {
  Serial.begin(57600);
  pressure_sensor.begin(DOUT, SCLK);
}
 

labsguru

void setup() {
  pinMode(A0, INPUT);
  Serial.begin(9600);
} //https://kitsguru.com/products/ky-039-finger-detection-heartbeat-measuring-sensor-module

void loop() {
  float pulse;
  int sum = 0;
  for (int i = 0; i < 20; i++)
    sum += analogRead(A0);

labsguru

  /*
  AS608-Optical-Fingerprint-Sensor-enroll
  Home based on Adafruit Library
//https://kitsguru.com/products/as608-optical-fingerprint-sensor-fingerprint-module
*/
#include <Adafruit_Fingerprint.h>

SoftwareSerial mySerial(2, 3); // TX/RX

Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

labsguru

#define SensorPin 0         
unsigned long int avgValue;
float b;
int buf[10],temp;
 
void setup()
{
  pinMode(13,OUTPUT);  
  Serial.begin(9600);  
}

labsguru

/*
Connect the voltage signal wire to Arduino analog interface:
Yellow Cable<---->A0
*/
 void setup()
 {
   Serial.begin(9600);
 }
 void loop()
 {

labsguru

#define SensorPin A0          // the pH meter Analog output is connected with the Arduino’s Analog
unsigned long int avgValue;  //Store the average value of the sensor feedback
float b;
int buf[10],temp;
void setup() //https://kitsguru.com/products/industrial-grade-analog-ph-sensor-kit
{
  pinMode(13,OUTPUT);  
  Serial.begin(9600);  
  Serial.println("Ready");    //Test the serial monitor
}

labsguru

/************************************************************
Water pressure sensor demo(Computer serial port)
- Obtain the water pressure through the output voltage
of the sensor.
**************************************************************/
//https://kitsguru.com/products/x-mpa-stainless-steel-pressure-transducer-sensor
/************************************************************
Water Sensor Key Parameter
- Parts No.:KY-3-5
- Sensing range: 0 - 1.6 MPa

labsguru

int inPin = 2;         // Tilt Sensor
int outPin = 13;       // LED Pin
//https://kitsguru.com/products/tilt-switch-sensor-module-for-arduino
int LEDstate = HIGH;      // the current state of the output pin
int reading;           // the current reading from the input pin
int previous = LOW;    // the previous reading from the input pin

// the following variables are long because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long time = 0;         // the last time the output pin was toggled

labsguru

const int knockPin = 8; //https://kitsguru.com/products/the-knock-sensor-module
const int ledPin = 7;
int knockVal = HIGH;
boolean knockAlarm = false;
unsigned long prevKnockTime;
int knockAlarmTime = 100;

void setup ()
{
  Serial.begin(9600);